Function parse_describe_key_arg 

pub fn parse_describe_key_arg(s: &str) -> (Option<BindingMode>, &str)

Parse a :describe-key argument that may carry a mode prefix.

Supports the six primary-mode prefix shorthands:

prefix	mode
n_	Normal
i_	Insert
v_	Visual
r_	Replace
c_	Command
s_	Search

Returns (mode, chord_str):

• mode is Some(BindingMode) when a prefix was recognised; chord_str is the remainder after stripping the x_ prefix.
• When no prefix matches, mode is None and chord_str is the original input unchanged.

Examples

use lattice_keymap::{BindingMode, parse_describe_key_arg};

let (mode, chord) = parse_describe_key_arg("n_j");
assert_eq!(mode, Some(BindingMode::Normal));
assert_eq!(chord, "j");

let (mode, chord) = parse_describe_key_arg("<C-w>j");
assert_eq!(mode, None);
assert_eq!(chord, "<C-w>j");

let (mode, chord) = parse_describe_key_arg("i_<C-n>");
assert_eq!(mode, Some(BindingMode::Insert));
assert_eq!(chord, "<C-n>");